<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div>
        <span>全选:</span>
        <input type="checkbox" v-model="isAll" />
        <button @click="reverseChecked">反选</button>
        <ul>
          <li v-for="v of arr" :key="v.name">
            <input type="checkbox" v-model="v.checked" />
            <span>{{ v.name }}</span>
          </li>
        </ul>
      </div>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: '#app',
        data: {
          arr: [
            {
              name: '猪八戒',
              checked: false,
            },
            {
              name: '孙悟空',
              checked: false,
            },
            {
              name: '唐僧',
              checked: false,
            },
            {
              name: '白龙马',
              checked: false,
            },
          ],
        },
        computed: {
          isAll: {
            get() {
              return this.arr.every(v => v.checked);
            },
            set(newValue) {
              this.arr.forEach(v => {
                v.checked = newValue;
              });
            },
          },
        },
        methods: {
          reverseChecked() {
            this.arr.forEach(v => {
              v.checked = !v.checked;
            });
          },
        },
      });
    </script>
  </body>
</html>
